Development of sol-gel-based fiber optic nitrogen dioxide gas sensors

We report herein the development of sol-gel-based fiber optic sensors to monitor gaseous nitrogen dioxide based on two different w .x indicating chemistry encapsulations. The first consists of the immobilization of a ruthenium complex, Ru bpy Cl within a silica 32 , sol-gel matrix, while the second design is based on the co-immobilization of the dye Acridine orange and the Saltzman reagent encapsulated within a silica sol-gel matrix. The sensors are placed in a manifold test chamber and nitrogen dioxide gas at various concentrations is flowed into the chamber. A miniature optoelectronics package was developed to acquire data from the sensors. The w .x nitrogen dioxide sensor encapsulating the Ru bpy Cl demonstrates sensitivity in the hundreds parts per million range with reversibility 32 while the nitrogen dioxide sensor utilizing the Acridine orange dye demonstrates sensitivity in the parts per million range; however, it is not reversible. q 2000 Elsevier Science S.A. All rights reserved.

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